--Message-Boundary-8137 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body On 4 Nov 2003 at 22:19, Chris Oesterling wrote: > Please excuse my ignorance. I want to attach a 16C622A to a Laipac > TF30 3.3 VDC GPS receiver. The TF30 input and output pins are 4800 > baud serial but at 0 and 3.3 VDC levels. I am concerned the PIC's 5 > volt output will damage the TF30 input. My other concern is when I > apply power the circuit the PIC's input pin will float during the 70ms > power up timer. Any input (pardon the pun) would be most appreciated. > Thanks. - Chris Check out this schematic, used to interface a 3.3V Trimble GPS. The transistors levele shift the TxD output to 5V, the 10k resistor limits the current flowing into the RxD input. Not the most elegant, makes certain assumptions about the RxD input protection, but it can work. -- Brent Brown, Electronic Design Solutions 16 English Street, Hamilton, New Zealand Ph/fax: +64 7 849 0069 Mobile/txt: 025 334 069 eMail: brent.brown@clear.net.nz -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. 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